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Convective cooling expression
Posted 2012年5月2日 GMT-4 11:15 Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 1 Reply
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Hello:
In Heat Transfer module, what is the reference for expression for convective heat transfer coefficient for external natural convection and others, such as Rayleigh #?
COMSOL shows following expression for ht.h_cc
nojac(ht3.kExtFluid_cc2*(flc1hs(1000000000-ht3.Ra_cc2,100000000)*(0.68+0.67*ht3.Ra_cc2^0.25*cos(ht3.phi_tilt)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.4444444444444444)+flc1hs(-1000000000+ht3.Ra_cc2,100000000)*(0.825+0.387*ht3.Ra_cc2^(1/6)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.2962962962962963)^2)/3)
Thanks
In Heat Transfer module, what is the reference for expression for convective heat transfer coefficient for external natural convection and others, such as Rayleigh #?
COMSOL shows following expression for ht.h_cc
nojac(ht3.kExtFluid_cc2*(flc1hs(1000000000-ht3.Ra_cc2,100000000)*(0.68+0.67*ht3.Ra_cc2^0.25*cos(ht3.phi_tilt)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.4444444444444444)+flc1hs(-1000000000+ht3.Ra_cc2,100000000)*(0.825+0.387*ht3.Ra_cc2^(1/6)/(1+(0.492*ht3.kExtFluid_cc2/(ht3.muExtFluid_cc2*ht3.CExtFluid_cc2))^0.5625)^0.2962962962962963)^2)/3)
Thanks
1 Reply Last Post 2012年5月2日 GMT-4 15:28
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Posted:
1 decade ago
You will find the equations used described in the manual in “Heat Transfer Module > Heat Transfer Theory > About the Heat Transfer Coefficients”. Most of the equations are from these two references:
1. F.P. Incropera and D.P. DeWitt, Fundamentals of Heat and Mass Transfer
2. A. Bejan, Heat Transfer
Nagi Elabbasi
Veryst Engineering
1. F.P. Incropera and D.P. DeWitt, Fundamentals of Heat and Mass Transfer
2. A. Bejan, Heat Transfer
Nagi Elabbasi
Veryst Engineering